“…TP53-governed apoptosis is considered the main cause of ionizing radiation-induced cell death, despite the fact that some cancer cells undergo TP53-independent apoptosis (Afshar, Jelluma et al, 2006, Strasberg Rieber, Zangemeister-Wittke et al, 2001. Therefore, the radioresistant tumor cells are often accompanied by TP53 mutation or repression, high levels of BCL2, or inhibition of the other apoptosis-related genes (Brown & Wouters, 1999, Leone, Humar et al, 1997, McGill & Fisher, 1997, Reed, Miyashita et al, 1996, Yaes, 1989. In NPC, it has been suggested that latent membrane protein 1 (LMP1), encoded by Epstein-Barr virus, blocks apoptosis and thereby facilitates radioresistance of the tumor cells (Lu, Ma et al, 2008).…”